w3c.css.properties.css3.CssFontLanguageOverride Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of cssvalidator Show documentation
Backend for the W3C CSS Validation Service
There is a newer version: 1.0.8
// $Id$
// Author: Yves Lafon 
//
// (c) COPYRIGHT MIT, ERCIM and Keio University, 2012.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css3;

import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssString;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.external.OpenTypeLanguageSystemTag;

import java.util.Arrays;

/**
 * @spec http://www.w3.org/TR/2011/WD-css3-fonts-20111004/#propdef-font-language-override
 */
public class CssFontLanguageOverride extends org.w3c.css.properties.css.CssFontLanguageOverride {

    public static final CssIdent normal;

    static {
        normal = CssIdent.getIdent("normal");
    }

    /**
     * Create a new CssFontLanguageOverride
     */
    public CssFontLanguageOverride() {
        value = initial;
    }

    /**
     * Creates a new CssFontLanguageOverride
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Expressions are incorrect
     */
    public CssFontLanguageOverride(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        if (check && expression.getCount() > 1) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        CssValue val;
        char op;

        val = expression.getValue();
        op = expression.getOperator();

        switch (val.getType()) {
            case CssTypes.CSS_STRING:
                CssString s = (CssString) val;
                // limit of 3 characters + two surrounding quotes
                if (s.toString().length() != 5) {
                    throw new InvalidParamException("value",
                            expression.getValue().toString(),
                            getPropertyName(), ac);
                }
                // we extract the 3 letters from the quotes...
                String tag = s.toString().substring(1, 4).toUpperCase();
                // valid values are specified here.
                int idx = Arrays.binarySearch(OpenTypeLanguageSystemTag.tags, tag);
                if (idx < 0) {
                    // TODO specific error code
                    throw new InvalidParamException("value",
                            expression.getValue().toString(),
                            getPropertyName(), ac);
                }
                value = s;
                break;
            case CssTypes.CSS_IDENT:
                CssIdent ident = (CssIdent) val;
                if (inherit.equals(ident)) {
                    value = inherit;
                    break;
                }
                if (normal.equals(ident)) {
                    value = normal;
                    break;
                }
            default:
                throw new InvalidParamException("value",
                        expression.getValue().toString(),
                        getPropertyName(), ac);
        }
        expression.next();
    }

    public CssFontLanguageOverride(ApplContext ac, CssExpression expression)
            throws InvalidParamException {
        this(ac, expression, false);
    }

}